Hi Chief, I know you posted awhile ago, but recently I started having the same problem you've described. When driving and a text arrives, there is no sound when I prompt for reading. I haven't tested it yet, but after some digging, I discovered an optional audio setting in Assist. To try it, open Assist. Then, touch the three dots in the upper corner and open Settings. Under Talk to Me, click Audio Troubleshooting. Then choose Alternate Audio Channel. I'll test it after work, but I hope the change solves the problem.